Hey you all!
I am taking a neuroscience class and am struggling with the Nernst equation.
I am doing something wrong, because I never seem to get the answer right.
Here is the question, and sorry if I am posting this in the wrong threads: Calculate the reversal potential of a calcium selective conductance at 37 Celsius if the intracellular calcium concentration is 1 uM and the extracellular calcium concentration is 2 mM.
I am assuming I have to convert 1 uM to mM... would be 2000 mm?
I have tried this:
E CA +2 : RT over ZF x IN (Ca+ 2 over 1)
= 8.314 Joules over +2 times 310.15 over 96.500
I keep getting wrong numbers when calculating:
The multiple choice answers are as follows:
1. - 90 mV
2. - 103.5 mV
3. 101.5 mV
4. 203.0 mV
My guess is -103.5, but I don't just want to be guessing. I want to know how to do the equation properly and how to get the correct answer.